'use strict';
var single_element = function(collection){
  var num = [];
  var a = []
  for (let i = 0; i < collection.length; i++) {
    if((i+1)%2==0){
      num.push(collection[i]);
    }
  }
  for (let i = 0; i < num.length; i++) {

  }
};
module.exports = single_element;
